:root{
  --bg:#0b0d10;
  --panel:#14181d;
  --card:#171c22;
  --text:#e8eef4;
  --muted:#99a6b5;
  --primary:#3aa0ff;
  --accent:#66d17a;
  --danger:#ff6b6b;
  --border:#25303a;
  --shadow: 0 6px 20px rgba(0,0,0,.35);
  --radius:16px;
}

[data-theme="light"]{
  --bg:#f8fafc;
  --panel:#ffffff;
  --card:#ffffff;
  --text:#1e293b;
  --muted:#64748b;
  --primary:#2563eb;
  --accent:#16a34a;
  --danger:#dc2626;
  --border:#e2e8f0;
  --shadow: 0 6px 20px rgba(0,0,0,.08);
}

*{box-sizing:border-box}
html{height:100%}
body{
  min-height:100vh;
  margin:0;
  padding-bottom:40px;
  background: var(--bg);
  color:var(--text);
  font:16px/1.6 system-ui, -apple-system, Segoe UI, Roboto, "ヒラギノ角ゴ ProN", "Meiryo", sans-serif;
  transition: background-color 0.3s ease, color 0.3s ease;
}

body:not([data-theme="light"]){
  background: radial-gradient(1200px 700px at 20% -10%, #0e141d, #0b0d10 60%),
             radial-gradient(800px 500px at 110% 10%, #0e1319, transparent 60%);
}

.site-header{
  padding:32px 20px 10px;
}
.header-content{
  display:flex;
  justify-content:space-between;
  align-items:center;
  max-width:1100px;
  margin:0 auto;
}
.header-content > div{
  text-align:center;
  flex:1;
}
.site-header h1{margin:0;font-size:28px;letter-spacing:.3px}
.subtitle{margin:.5rem 0 0;color:var(--muted);font-size:14px}

.theme-toggle{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:12px;
  padding:8px;
  cursor:pointer;
  color:var(--text);
  transition:all .2s;
  flex-shrink:0;
}
.theme-toggle:hover{
  background:var(--panel);
  border-color:var(--primary);
}
.theme-icon{
  font-size:20px;
  display:block;
}

.tabs{
  display:flex;
  gap:8px;
  padding:10px 20px 0;
  flex-wrap:wrap;
  justify-content:center;
  max-width:1100px;
  margin:0 auto;
}
.tab{
  border:1px solid var(--border);
  background:var(--card);
  color:var(--text);
  padding:10px 14px;
  border-radius:12px;
  cursor:pointer;
  box-shadow:var(--shadow);
  transition:all .2s;
}
.tab:hover{
  background:var(--panel);
}
.tab.active{
  border-color:var(--primary);
  outline:1px solid color-mix(in oklab, var(--primary), transparent 70%);
  background:var(--primary);
  color:white;
}

main{
  padding:14px;
  max-width:1100px;
  margin:0 auto;
}

.panel{display:none}
.panel.active{display:block}

.card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:18px;
  box-shadow:var(--shadow);
}

.grid-2{
  display:grid;
  gap:16px;
  grid-template-columns:1fr 1fr;
}
@media (max-width:900px){
  .grid-2{grid-template-columns:1fr}
}

.label{display:block;margin-bottom:6px;color:var(--muted);font-size:13px}
textarea, input, select{
  width:100%;
  background:var(--panel);
  color:var(--text);
  border:1px solid var(--border);
  border-radius:12px;
  padding:10px 12px;
  outline:none;
}
textarea{resize:vertical}

.row{display:flex; gap:12px; align-items:center; flex-wrap:wrap; margin-bottom:10px}
.row:last-child{margin-bottom:0}
.field{min-width:220px}
.field.grow{flex:1}

.checkbox{
  display:inline-flex;
  gap:8px;
  align-items:center;
  color:var(--muted);
  cursor:pointer;
  white-space:nowrap;
}
.checkbox input[type="checkbox"]{
  cursor:pointer;
  margin:0;
  width:auto;
  flex-shrink:0;
}
.checkbox span{
  user-select:none;
  white-space:nowrap;
}

.btn{
  background:var(--card);
  color:var(--text);
  border:1px solid var(--border);
  border-radius:12px;
  padding:10px 14px;
  cursor:pointer;
  transition:all .2s;
}
.btn:hover{
  background:var(--panel);
  border-color:var(--primary);
}
.btn.primary{
  background:var(--primary);
  border-color:var(--primary);
  color:white;
}
.btn.primary:hover{
  background:color-mix(in oklab, var(--primary), black 10%);
}
.btn:active{transform:translateY(1px)}

.status{color:var(--muted);font-size:13px}
.hint{color:var(--muted);font-size:13px;margin-top:6px;margin-bottom:10px}
.mt{margin-top:10px}
.gap{gap:10px; margin-top:8px}

.mapping-list{
  margin:10px 0 0;
  padding-left:20px;
  display:grid;
  gap:6px;
}
.mapping-list li{
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:10px;
  padding:6px 10px;
}
.mapping-list li .pair{color:var(--accent);font-weight:600}
.mapping-list li.anim{
  outline:1px solid color-mix(in oklab, var(--accent), transparent 60%);
  background:color-mix(in oklab, var(--accent), transparent 90%);
}

.matrix-wrapper{
  margin-top:14px;
  display:inline-block;
  padding:8px;
  background:var(--card);
  border:1px solid var(--border);
  border-radius:14px;
  box-shadow:var(--shadow);
}

.matrix-preview{
  margin:8px 0 -20px;
  display:flex;
  justify-content:center;
}
.matrix-preview .matrix-wrapper{
  margin:0;
  transform:scale(0.85);
  transform-origin:top center;
}

.matrix{
  display:grid;
  gap:8px;
  justify-content:center;
}
.matrix .cell{
  width:54px; height:54px;
  display:flex; align-items:center; justify-content:center;
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:12px;
  font-weight:600;
  color:var(--text);
}
.matrix .cell.coord{color:var(--muted); background:var(--card)}
.matrix .cell.highlight{
  border-color: var(--primary);
  outline:1px solid color-mix(in oklab, var(--primary), transparent 60%);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--primary), transparent 85%);
}
.matrix .cell.keyword-char{
  color: var(--accent);
  font-weight: 700;
  background: color-mix(in oklab, var(--accent), transparent 90%);
}

.toast{
  position:fixed;
  bottom:18px; left:50%;
  transform:translateX(-50%);
  background:var(--card);
  color:var(--text);
  border:1px solid var(--border);
  border-radius:12px;
  padding:10px 14px;
  box-shadow:var(--shadow);
  opacity:0;
  transition:opacity .25s ease;
}
.toast.show{opacity:1}

footer{
  margin:32px auto 24px;
  max-width:1100px;
  padding:0 14px;
  color:var(--muted);
  text-align:center;
}
.footer{
  display:inline-block;
  background:var(--card);
  border:1px solid var(--border);
  border-radius:12px;
  padding:8px 12px;
}
.footer a{color:var(--primary); text-decoration:none}
.privacy{margin:.6rem 0 0; font-size:13px}

.info-box{
  margin-top:20px;
  padding:16px;
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:12px;
}
.info-box h3{
  margin:0 0 12px;
  color:var(--text);
  font-size:16px;
}
.info-box ul{
  margin:0;
  padding-left:20px;
  color:var(--muted);
  font-size:14px;
}
.info-box li{
  margin:4px 0;
}

.code-block{
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:10px;
  padding:12px 16px;
  color:var(--accent);
  font-family:'Consolas', 'Monaco', monospace;
  font-size:14px;
  overflow-x:auto;
}

#tab-history h3{
  margin:24px 0 12px;
  color:var(--text);
  font-size:18px;
}
#tab-history p{
  color:var(--muted);
  margin:12px 0;
}
#tab-history ul{
  color:var(--muted);
  margin:12px 0;
  padding-left:24px;
}
#tab-history li{
  margin:6px 0;
}
#tab-history strong{
  color:var(--text);
}

.help-icon{
  display:inline-block;
  width:18px;
  height:18px;
  margin-left:4px;
  background:var(--primary);
  color:var(--card);
  border-radius:50%;
  font-size:12px;
  font-weight:bold;
  text-align:center;
  line-height:18px;
  cursor:help;
  position:relative;
  transition:background .2s;
  flex-shrink:0;
}
.help-icon:hover{
  background:var(--accent);
}
.help-icon::after{
  content:attr(title);
  position:absolute;
  bottom:calc(100% + 8px);
  left:50%;
  transform:translateX(-50%);
  min-width:200px;
  max-width:280px;
  padding:8px 10px;
  background:var(--card);
  color:var(--text);
  border:1px solid var(--border);
  border-radius:8px;
  font-size:12px;
  font-weight:normal;
  line-height:1.4;
  white-space:normal;
  opacity:0;
  visibility:hidden;
  transition:opacity .2s, visibility .2s;
  z-index:100;
  box-shadow:var(--shadow);
}
.help-icon:hover::after{
  opacity:1;
  visibility:visible;
}

.output-header{
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin-bottom:6px;
}

.btn-copy-small{
  background:var(--card);
  color:var(--text);
  border:1px solid var(--border);
  border-radius:8px;
  padding:4px 8px;
  cursor:pointer;
  font-size:16px;
  line-height:1;
  transition:all .2s;
}
.btn-copy-small:hover{
  background:var(--panel);
  border-color:var(--primary);
  color:var(--primary);
}
.btn-copy-small:active{
  transform:translateY(1px);
}